Gah, stupid laws of thermodynamics!

I bought this RGB LED off eBay - http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=360091115534 - is very nice. The problem now is soldering to it. Since the backing is a giant heatsink, guess what my soldering iron can't heat up?

Yeah. Sigh.